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Find answers to Frequently Asked Questions for First Generation Firebirds that have been asked on First Generation Firebird-L mailing list. Special thanks needs to be given to all the Firebird-L owners that took the time to respond to other subscribers questions. These pages are continuously updated as new information is posted on the mailing list.
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| Q: | "Numbers Matching" |
| How do you know if you have a numbers matching car. | |
| A: | People still call cars "numbers matching" if all of the Part Numbers and Casting Codes are correct and pre-date the car by the correct 1-3 months (in general). |
| A: |
Use the following web pages on the First Generation Firebird web site as a guide: 1967: http://FirstGenFirebird.org/firebird/1967/id_numbers.html 1968: http://FirstGenFirebird.org/firebird/1968/id_numbers.html 1969: http://FirstGenFirebird.org/firebird/1969/id_numbers.html |
| Q: | 1967-8 Axle Codes |
| How do I identify the Sales Code for the axle ratio that is shown on the Billing History cards. | |
| A: |
In 1967, the ratio will be shown in the box marked 74 and in 1968, it will be shown in box 37. In both instances, the codes used to identify the axle ratio will be the same and they are as follows:
C = 2.56:1
D = 2.78:1
E = 2.93:1
F = 3.08:1
G = 3.23:1
H = 3.36:1
K = 3:55:1
P = 3.90:1
S = 4.33:1
Note: Do not confuse these Sales Codes with the two-digit code that is stamped on the axle tube.
I hope that this information helps answer most axle ratio related questions. |
| Q: | Rear End Code Facts |
| I am confused by the codes found on the rear end. | |
| A: |
After reading all the comments, I thought
I'd better give some facts. The 1967 Firebird axle housings have the
loops (where control arm bushings would mount) on top of the center
chunk as if they were getting A-body control arms, but they also have
the spring perches for leaf springs, and the brackets for the factory
style "traction bars". There should also be a date code cast into the
center section somewhere. In 1968 they left off the control arm bushing
loops and the traction bar mounts, but seemed to use the same codes as
1967. In 1969 the date code position moved from one side of the center
section to the other, but I can't get to my rearend housings to see
which are which. Another change from 68 to 69 was the addition of
flattened spots on top of the axle tubes where the snubbers meet the
housing, 67 and 68 did NOT have the flat spots. Again, check your cast
date codes if at all readable.
Also, all 3 years had the 2-letter stamped code in roughly the same position, about 3-5 inches to the LEFT of the center section, on the rear of the left axle tube (left being the driver's side of the car). Many times it is obscured by the steel brake line - you'll need to loosen the clip welded to the axle tube and raise the brake line a bit to see it. The 69 codes were different. Here's the list (first the open ratio, then the posi): 1967 & 1968: 1969: 2.56 XB UN YB ZB 2.78 XC UP YC ZB 2.93 XD UR YD ZB 3.08 XE US YE ZE 3.23 XF UT YF ZF 3.36 XG UV YG ZG 3.55 XH UW YH ZH 3.90 -- UX -- ZK 4.33 -- UY -- ZM I hope this clears up some confusion and misinformation. Whenever possible, ask about date codes (same style of codes as engine parts), axle codes (rear of left tube), spring perch depth (67 Monoplates are shallow), whether it has the extra brackets for traction bars (67 only), or if there are flattened spots on top (69 only). |
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